I am trying to configure g2IPmessenger on ubuntu oneric and getting this gtk configuration related error.

checking for gtk-config... no
checking for GTK - version >= 1.2.0... no
*** The gtk-config script installed by GTK could not be found
*** If GTK was installed in PREFIX, make sure PREFIX/bin is in
*** your path, or set the GTK_CONFIG environment variable to the
*** full path to gtk-config.
configure: error: GTK not installed

I also installed libgtk-3-dev but still same error is coming at the time of configuration.